Drum structure for ring and roll mills



h. FJDORE ET AL 2,478,467

DRUM STRUCTURE FOR RING AND ROLL MILLS Filed Sept. 17, 1945 2 Sheets-Sheet 1 JNVENYTO'RS. 1201781 2 FDore 9 {fieor ge L (7111150 20 Aug. 9, 1949.

R. F. DORE ET AL DRUM STRUCTURE FOR RING AND ROLL MILLS 2 Sheets-Sheet 2 Filed Sept. 17, 1945 INVENTORS. R 0691:? I? Dore Q L- Chitiso mq H TTORNEY- Patented Aug. 9, 1949 STRUCTURE 'FGBABINGEANIEROLL :rMILLS Applieatiomstepiember 17, 1945;:Serial' Noe 616,662

' V L'SQClaims. (013241491) 7 V 7 1 invention relates to: a drunrstructure-ior av ring-and roll mill. 7 a object of the invention is-ithe provision :of a. drum structure for a ring :and: roll? millewmoh ,will grind oreinsuch amanner thatolassification of the ore is eliminated.

rThetmill'of the; present inventionrutilizes; an assemblage of equaldiameter'v-grinding rings tosform a:-.;dr um. An-tobjectl-ofth rinventionsis. to;:pr0- vide a construction whereby: :the grinding rings maybe maintained ona common axisrand -rpositively heldagainst shifting-fin ayplaneztransverse :tothe ring axis or alongcthezringa axis.

Wit-h respect to the, aforementionedi sobject,Y it is ;-essential .thattthe :rings be maintained unitormlyspacedz apart, tocthezend that-ctheifinesare of; a predetermined size.

A further object consists-tin .ta:,=con'struc.tion whereby the .g'rinding rings-maybe rapidlyl assembled or dismantled.

further object is the rprovision E of means adapted to readily: permit'- the':'separation .ofzmill ends in avmill: of. the: characterestated.

A further feature of the; invention resides-in et novel means for. spacing the grinding rings.

Furtherobjeetsincludea device -which is simple of structure, inexpensive: in cost to -manufacture, and superior .to mills now known to' the inventor.

With the. above mentioned:and other objects inview, therinvention contemplateszthenoveland useful provision, formation; construction, -associationand relative arrangement-of parts, members and :features ;a1l;;-as shown in :;the Y drawings, described: generally: inxtthe: specification andumore particularly pointed out in the claims.

In the rdrawings Fig.- ,1: 153a fragmentary-and: sectionaL elevation of ,-the improved mill Fig. 2-;is a sectionalzrview on=:the

Fig.1; I

Fig. 3 is an enlarged ,[fragmentary 1 seotiona view on .the line 3-3.-of,-Eig.'-2;

Fig. v i t-is 2 a fragmentary; sectionaon tithe. line l-'-4 of. Fig. 3; e 3

Fig.5 isa perspectiverviewgof:onemf the-:shim

members; 7

Fig. 6 is a perspective 'view n er-in s;

f Fig. 7 is an enlarged c fragmentarysectionalzvsiew on the line 1-1 of Fig. 2; and, v

Fig- 8, is a; -perspective view: ,ofeone gof-ythezities used in ;:the. practicet-ofthe invention. e

' Referring now: to. the: drawings 2 tWeA- shave illustrated i :Fig

line? 2-;2 m

ofionezof thezgrinm millrillustrat- .122 a hand between --which is l-positionedagrinding rings .3. of the charactereshownf-in Fi 6. JIFhese rings rare 5 all on the ;-same axis-and of the same diameter landvconstruction. v It is r-intended that the. ringsshould-be spaced: apart; to permit the fines alto passbetween the .ringsior peripheral discharge. 1Ordinarilytan:assemblyaof rings as shown; inFig. 1. interposedv between endssl :and 2., is termed a .=drum,- and iwithinnthea-saidvdrum and adapted to rest upon the ring transversely thereof-is positioned one or'morej elongated rollers of --selectedwweight (seesrEi :2) The rollers::are adapted to -roll and slideuover itheuore. received Within the drum. for the purpose of grinding; the Sail-161110 'a iSiZB suflicient to i permit the discharge thereofebetween the-rings; Thesdrum is adapted togbetrotated by some.:-external tmeans and tozithis end the drum is suitably supportedzupon .anxaxial tubnlar shaft 4. :The-itubulargshaftzin turnwis carried inbearingiblocks z5szand -B,;Which:are mounted upon; suitable supports adapted to. carry the :weight :of theidrum. The supporting: structure is shown: at 'lwandeincludes :endImernber QB and .9;with interconnecting .transversegbracing 'I 0; As showrrinr-Fig. 7;.tthe end 1 ,tasilikewise the en'd 2,:rotates with the sha'ft bybeingzkeyed-idiametrioallytheretopas findicated ata H 1 I ":The :present: invention is primarily directed to avmill; ofrthe; characterjust brie-fly described; in-

2 and adjacent the rims thereof are ties of -the type shown in Fig. :8, designatedeas 'an entirety by?! 2. ifIhese: ties" are spacedly e arranged in sub-' stantial parallelism between the'mill'ends; Each tieeincludes :an'elongated body 'carrying at each end-pairs of spa-cedv apart; screw-threaded-studs t3 and for-one end and 'liand i6 for the 0ther: :end. These 'threaded stiids' mayhe eonvenientlyheldawithin the 'tieby -providing the tie withscrewihreaded bores, as shown "for instance in gzFig. .3, oat II. It isintended "that -eaeh-tie should be so mounted between the mill endsas to beacapable of swinging movement on the threaded Lstudsi I3 and -IB. "It may thus be 'said that the. elongated tie I is one form' of 1 swing arm of'extended width and short length. lhe p'ortion ofzthe tie thatacarr'ies' thestu'ds M and l5-'is';providedewith an eelongated and rounded flange-or li thentent qnaand rmh te nal providedaends 65 tongues. i miametricallly opposite the flange' or 3 tongue I8 is a web I9, which may vary as to depth between ends of the tie, best shown in Fig. 8. The web is provided for the purpose of preventing any bending movement of the tie in the plane of the tongue or flange I8. If the size of the mill has been selected and the spacing between the mill ends is known, ties of a given length will be provided, the threaded studs I3 and I6 passed through openings adjacent the periphery of the mill ends and said studs locked to the mill ends by means of oppositely contacting nuts carried on said studs, as indicated by way of example in Fig. 1, at 20 and 2|. Each mill end has a plurality of spaced peripheral and inwardly extending curved slots 22, the arc of each slot uses the point of rotation of a tie as a center, whereby when a tie is moved from the dotted line position in Fig. 4 to the full line position of said figure the pins I4 and I will move within the slots 22. To look the tie against movement after a pin has been received within a slot 22, each pin I4 and I5 carriestwo nuts 24 and 25,-the nut 24 being positioned for con- "tact with the inner surface of the mill end, while the nut 25 contacts the beveled outer surface of the mill end adjacent slot 22, as is best shown in Fig. 3. A tightening of nut 25 will effectively lock the tie against swinging movement and its resultant dislocation of the studs from the slot or slots.

The rings of Fig. 6 are constructed to be in cross-section in the form of the frustum of a pyramid. In other words, the rings from the inner surface to the periphery thereof have tapered sides. This is also illustrated in Fig. 3, the inner surface of the ring being of greatest Width. Said rings are provided with a plurality of equidistantly spaced apart transverse curved grooves 26; the curvature of said grooves corresponds to the curvature of the flange or tongue I8. In order to properly space the rings apart when it is intended to assemble them into drum form, I have provided the shims shown in Fig. 5 and designated as 21. The side shims include two spaced apart end members 28 and 29, with interconnecting spaced pieces 30 and 3|. This construction provides a way between members 30 and 3|, and in the plane of the way, the ends 28 and 29 are both curvedly grooved, as-shown at 32 and 33. It is intended that'the shims should straddle the rings transversely thereof and at the zone of the transverse grooves 26, the curvature of the grooves 32 and 33 corresponding to the depth of the grooves 26 of the ring, while connecting pieces 30 and 3| transversely overlie the ring on opposite sides of a groove 26.

v In assembling the rings so as to form a drum of a definite size, one mill end is secured to the shaft 4, whereupon the shaft is placed in a vertical position. The selected number of ties I2 may be secured to the mill end, with each tie swung to the open position shown in dotted lines at 23 in Fig. 4. The rings 3 are then assembled, one on top of the other, with the shims of proper thickness positioned adjacent the grooves 26 of alternate rings, so that a stack of-spaced ringsis provided. After a selected number of rings has been assembled the opposite mill end may be brought into position and the ties secured to said end through the medium of the stud I3 and nuts 20 and 2| carried thereby. To assure that all of the grooves 26 of the rings are in alignment and maintained in such alignment, one of 22 of the mill ends in every instance.

'4 flange I8 may enter grooves 32 and 33 of the shims, and likewise align grooves 26 in the rings. This tie may be tightened by turning the nuts 24 and 25. Thereafter the other ties may be swung into position, so that the tongue or flange I8 thereof will enter the ring and shim grooves. The bolts I4 and I5 enter the. curved grooves After assemblage of the rings between the mill ends, the drum may be lowered to a horizontal position and the shaft 4 positioned in the bearing blocks 5 and 6. The mill ends are provided with hubs which extend outwardly from the outer faces thereof. The hubs form castings together with the mill ends, each hub provided with diametric lugs, as for instance illustrated in Fig. 2 at I00 and HM, and which lugs are thereafter split up to the outer face of the mill end. The lugs are transversely bored so as to permit passage of bolts I02 therethrough, the bolts carrying the usual nuts I03. The actual bore of the hub is slightly greater than the diameter of the shaft. Thus after the mill ends have'been placed on the shaft withthe ties secured therebetween, the mill ends are capable of relative adjustment. By tightening the nuts I03 the lugs I00 and IDI are drawn together so that the hub tightly engages the-shaft. It is a simple matter to-place a mill end of the construction stated on a shaft and move it on said shaft prior to a tightening of the split hub. After the required spacing has been determined for the mill ends, the ties may be tightened so that movement thereof is prevented by tightening the nuts 20 and 2|; 24 and 25. The mill end 2' carries a pulley or Wheel34, and it is intended that a belt, chain or other device shall have contact with this wheel and with a motor, whereby the drum may be rotated. Adapted to surround the drum and spaced from the periphery thereof,is a casing 35. This casing is in two parts, the two parts being hinged at 36, whereby the part 31 may be lifted upwardly for inspection of the drum'or for other purposes. The casing 35 has an inclined portion at 38, whereby when the drum is in operation, and grinding ore the fines will be projected against the casing and directed outwardly in the direction of the arrow 39 to permit recovery of the fines. The casing 35 is provided with flanged ends 40 for confining the fines within the casing. This casing is held to the supporting structure 1 in any convenient manner. For instance, the hinge pin 4| for the hinge extends between extensions 42 and 43 carried on the supports 1 and 9.

The operation, uses and advantages of the invention' areas follows: We assume that the rings have been properly assembled and locked by the ties. These ties not only draw the rings closely together, so that every ring will be spaced in accordance with the shim thickness, but assure that no sag occurs in the drum during actual use of the drum in the grinding of the ore. By providing each tie with means for locking the tie at'its ends to the mill ends, the ties are prevented from moving and the webs I9 prevent any bending movement in the plane of the flange I8. Thus all of the rings are maintained in alignment and the centers thereof all lie on the same axis.

Theinventors are aware that certain prior devices incorporate rings through which fines are directed, but so far as the inventors are aware no means has been provided of the simple charace the ties may be swung so that the tongue of ter of the present invention for preventing sag in the drum structure when the drum is partially filled with ore to be ground. As has previously been pointed out, rollers are utilized within the drum, these rollers being of considerable weight and extending substantially the width of the drum. Rollers of this character, particularly when engaging ore to be ground, often cause sag in the drum structure, particularly centrally of the drum structure. If sag occurs then the fines will vary as to particle size, due to the fact that the rings are pressed closer together at certain points of their periphery than at other points. When it becomes necessary to replace rings or shims it is a simple matter to release the ties, one at a time, and thereafter separate the mill ends and replace the ring or rings with their shims. Due to the fact that the rings have tapered sides the fines are not liable to be held between the rings. Inspection of the drum is readily allowed by lifting the casing portion 31 upwardly, and minor adjustments can be made as may be necessary, such as, for instance, tightening of the bolts 24 and 25, or 20 and 2|, for the ties.

In the practice of a mill of the character shown the ore enters the hollow shaft 4 at 45. This may be a dry or wet process, and the ore is received in the drum to be acted upon by the heavy rollers therein.

While it is not essential to the present invention, it may be mentioned that the present device incorporates a screenless, quick precision, continuousnon-slime, peripheral pulp discharge, eliminating classification for return of oversize, providing direct grinding action without loss of motion. It should also be mentioned that in the operation of a mill of this type best results are obtained by first reducing the ore in a rock crusher to size, probably half-inch or less, whereby quick grinding action and maximum capacity output can be had in the mill. It should also be mentioned, although the drawing does not show construction and it does not form a part of the present invention, that shaft 4 is usually provided with a series of transverse perforations. through which the are entering the shaft is discharged into the drum in order to distribute the ore properly. Also the shaft inward from bearing 5 is capped or closed to prevent passage of the ore completely through the shaft.

We claim:

1. A drum structure for a ring and roll mill including two spaced ends, a plurality of rings positioned between said ends, and circumferentially spaced ties extending between and swingingly mounted on the ends for releasable engagement with the rings for holding the rings in working relationship; each tie provided with a flange for transverse peripheral engagement with the rings to center the rings against relative radial shifting when all of the tie flanges engage the rings.

2. A drum structure for a ring and roll mill including a pair of mill ends, grinding rings positioned in axial alignment between said mill ends, and spaced ties transversely positioned between the mill ends for locking the mill ends and said rings in working relationship; each tie provided with means whereby the tie is swingingly mounted on the pair of mill ends; all ties provided with means for engagement with the grinding rings when the ties are swung to one position between the mill ends for maintaining the grinding rings on a common axis.

3. A drum structure for a ring and roll mill including a pair of spaced apart mill ends, ties extending between said mill ends and mounted thereon for radial swinging movement inwardly of the mill ends or outwardly thereof, a plurality of grinding rings positioned between the mill ends and inwardly of the ties, said ties engaging the rings when said ties are radially swung inwardly of the mill ends, and means whereby the ties are locked against movement when the said ties are engaging said rings to position said rings on a common axis.

4. A drum structure for a ring and roll mil] including a pair of mill ends and a shaft upon which said mill ends are mounted, spaced ties secured between and on the mill ends, each tie provided with means for swingingly mounting the same between the mill ends, a plurality of grinding rings positioned between the mill ends, and each tie provided with an elongated flange adapted to contact the periphery of the rings when said tie is swung inwardly ofthe mill ends, for holding all of said rings on a common axis.

5. A drum structure for a ring and roll mill including a pair of mill ends, a plurality of grinding rings between said mill ends, each grinding ring provided with a spaced peripheral series of transverse grooves and ties transversely extending between the mill ends and mounted thereon for locking the mill ends and the said rings in working relationship, said ties includin a transverse rib adapted to enter the grooves of said rings for holding the said rings on a common axis, and web members for each tie in the plane of the rib for transversely supportingthe rings and preventing bending movement in the tie.

ROBERT F. DORE. GEORGE L. CHRISOPE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 150,217 Anderson Apr. 28, 1874 153,171 Kirk et a1 July 21, 1874 406,287 Kehler July 2, 1889 410,078 Drendul Aug. 27, 1889 961,068 Cox June 7, 1910 1,105,713 Sturtevant et a1 Aug. 4, 1914 1,972,385 Hutton Sept. 4, 1934 2,255,213 Good Sept. 9, 1941 FOREIGN PATENTS Number Country Date 2,806 Great Britain 1873 

